The journey into the heart of the atom began with Ernest Rutherford. In 1911, he proposed the nuclear model of the atom, which was a groundbreaking shift from the earlier plum pudding model suggested by J.J. Thomson. Rutherford’s model came as a result of the famous Gold Foil Experiment conducted by Hans Geiger and Ernest … Read more
The discovery of radioactivity was a serendipitous event that marked a significant milestone in the field of physics. It all began with Henri Becquerel, a French physicist who, in 1896, was investigating the properties of phosphorescent materials. He was particularly interested in whether phosphorescent materials, such as certain uranium salts, emitted X-rays after being exposed … Read more
The idea of atoms as the fundamental building blocks of matter dates back to ancient Greece, but it wasn’t until the 19th century that the concept began to take a scientific form. John Dalton, in the early 1800s, proposed that each element is composed of unique atoms and that chemical reactions involve the rearrangement of … Read more
Before Bohr, there was a quest to understand the atom’s structure. In 1897, J.J. Thomson discovered the electron and proposed the ‘plum pudding model,’ which suggested that electrons were scattered within a ‘pudding’ of positive charge. However, this model couldn’t explain certain experimental results like the emission spectra or the outcomes of alpha particle scattering … Read more
The story of atomic spectra began long before the term was even coined. It’s a tale of curiosity and discovery that spans centuries. The earliest known studies of the dispersion of light date back to the Romans, who were aware of the ability of a prism to create a rainbow of colors. However, it was … Read more
Before Rutherford’s experiment, the atom was thought to be a ‘plum pudding’—a blob of positive charge with electrons dotted within, like raisins in a pudding. This model was proposed by J.J. Thomson, who had discovered the electron but couldn’t quite figure out how the positive charge was distributed. Ernest Rutherford, intrigued by the structure of … Read more
In the early 20th century, the nature of light was a hot topic. Scientists knew it behaved like a wave, thanks to Maxwell’s equations. However, in 1905, Albert Einstein proposed that light could also be seen as particles, or “quanta” of energy, which he called photons. This idea was revolutionary and earned him a Nobel … Read more
The story begins in the early 20th century. Scientists were exploring the nature of light and matter. They discovered that light, which was always thought to be a wave, also showed particle-like properties (as seen in the photoelectric effect). This led to the question: If light can be both a wave and a particle, could … Read more
The story of the photoelectric effect begins in the late 19th century. In 1887, Heinrich Hertz discovered that ultraviolet light could cause sparks to jump between two metal electrodes. Wilhelm Hallwachs followed up on Hertz’s work and found that ultraviolet light could make a zinc plate emit electrons, which he called “photoelectrons.” Fast forward to … Read more
Electron emission is a phenomenon that has intrigued scientists for over a century. It’s like a detective story that began in the 1800s, where the first clue was discovered quite by accident. Thomas Edison, the famous inventor of the light bulb, stumbled upon this mystery in 1880. While working on improving the light bulb, he … Read more